Rubidge, B. S. Sidor, C. A. Modesto, S. P. 2006 A new burnetiamorph (Therapsida: Biarmosuchia) from the Middle Permian of South Africa Journal of Paleontology 80 740-749 Haptodus Dimetrodon Syodon Titanophoneus Titanosuchidae Estemmenosuchus Gorgonopsia Biarmosuchus Hipposaurus Lycaenodon CGP_slash_1_slash_67 Lemurosaurus Lobalopex Proburnetia Burnetia Bullacephalus Pachydectes Osteology Maximum Parsimony Based on reanalysis of the original matrix. Rubidge_etal_2006a